Edward s



(No Model.)

E. S. BOYNTON.

- MEANS FOR SURFACE PRINTING.

N0..475,534. Patented May 24, 1892'.

WITNESSES: INVENTOH UNITED STATES PATENT OFFICE.

EDWARD S. BOYNTON, OF BROOKLYN, NEW YORK, ASSIGNOR EDWARD T. WILKINSON,OF SAME PLACE.

MEANS FOR SURFACE-PRINTING.

SPECIFICATION forming part of Letters Patent No. 475,534, dated May 24,1892.

Application filed February 20, 1890. $erial No. 341,136. (No model.)

To aZZ whom it may concern: ods employed in coating the grained zinc Beit known that I, EDWARD S. BOYN'ION, plates used in zineo-printing; butgreat and of Brooklyn, in the county of Kings and State marked improvedresults are obtained by this of New York, have invented a new andusemethod of printing over both lithographic or ful Means forSurface-Printing,whichinventrue stone printing and zinco-printing bytion is fully set forth and illustrated in the means of grained plates.following specification and accompanying In the use of grained platesthe zinc is first drawings. given a grained or roughened surface by Theobject of this invention is to provide means of the sand-blast orotherwise. This I a metallic plate for surface-printing which isnecessary for one reason and availed of for shall combine certainqualities or advantages another reason for certain Work. The roughof thelithographic stone not possessed by the ened or grained surface isnecessary in order zinc plates usedinzincographic printing, with thatthe zinc plate shall hold the gum-arabic all the advantages of the zincplates in addiwhich is coated upon the plate and hardened 15 tion. byphosphoric acid and also that it may hold The invention will first bedescribed in dethe inks of the fatty or saponaceous charactail, and thenparticularly set forth in the ter used. If the plate be intended toreceive claim. 1 the crayon design of the artist made directly In theaccompanying drawings, Figure 1 upon it, it must also be grained; but no2 shows a flat rectangular printing-plate, its grained plate can haveimprinted upon it by edges being slightly beveled; and Fig. 2, atransfer the impression taken from a grained curved plate forprinting-cylinders. plate.

As this invention pertains to the art of li- The advantages of thisinvention in the use thography,itwill be easilyunderstood bythose ofthis alloy-plate may therefore be summed 2 5 skilled in the art by abrief description of the up as follows: Owingto the fine hard porousmode found to be preferable in treating the surface of the plate, whichunder the microprinting-plates. Said plates can be rolled scope presentsthe appearance ofafine sponge, from an alloy of zinc and aluminum, thealloy, no sandblasting or other graining is required. as I havediscovered, being preferably in the The ink and the gum preparations areheld 0 proportion of, say, from four to six per cent. with perfectsatisfaction by the porous sur- So of aluminum or about one ounce ofaluminum face, and when a new design is required the to one pound ofzinc. The proportion may ink and gum may be removed, with but an besomewhat varied, though keeping the obinappreciable amount of metalsurface, by the j ectin View of obtaining a fine texture of porsamewashing and polishing by pumice-stone,

35 ous metal, which, if immersed in boiling Waas is done instone-printing, the alloy-plate, ter, will soften and bend to anydesired shape, however, lasting a far longer time before bebut whenallowed to cool will return to its ing worn too thin for use; but withthe ordioriginal state of temperthat is, to a hard nary zinc plate thefatty inks can be removed 7 and sonorous condition. A plate of thismetal only by very strong alkali solutions, or all the 40 may be cut tosize from rolled metal, as if an grainedsurfaee must be destroyed orremoved 0 ordinary zine plate, care being observed to mechanically or byacid before preparing the have its surface free from dross or metallicplate, by regraining, for receiving a new deimpurities. The smooth cleansurface should sign or impression. The surface of this alloy then haveimprinted upon it with lithographic plate is also always ready toreceive by trans- 45 ink the design or lettering required, and the fer apicture or design taken from the origi- 5 remainder of the surface becoated with a nal grained plate on which a crayon-drawing preparation ofgum-arabic or other suitable has been made. Of course, if a crayondrawgum and an acid, preferably phosphoric. All ing be desired on one ofthese porous alloy these details will readily be understood, as platesit may first be grained for the artists 50 they do not differessentially from the methpencil and the plate preserved as an originalI00 or impression plate, and the transfers from it A porous printingblock or plate for surmay then be made upon any number of theface-printing, composed of an alloy of zinc and lo smooth ungrainedalloy plates and these used aluminum, substantially as and for the purasprinting-plates until worn out, the original poses set forth.

5 remaining practically perfect from which to EDWARD S. BOYNTON.

take only transfers of the design or picture. Witnesses:

Having thus fully described my said inven- F. A. BROWER, tion, I claim-H. H. MCGAIL.

